Improvement in parallel rulers



J. B. PRICE.

PARALLEL RULER. No. 173,812. Patented Feb. 22,1876.

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cameos-mares PATENT OFFICE.

John B. PRICE, OF THOMPSONVILLE, CONNECTICUT.

IMPROVEMENT m PARALLEL RULERS.

" Specification forming part of Letters Ratent No. 1 73,812, datedFebruary 22, 1976; a lication filed January 26, 1876.

To all whom it may concern: 7

Be it known that I, JOHN B. Peron, of Thompsonville, State ofUonnecticuahaveinvented a Hatching-Ruler, of whichthe fol:

lowing is a specification:

My invention consistspin brief, of a ruler clamped between a triangleand friction-wheel upon opposite parallel edges, so that the rotarymovement of the wheel on one edge of the ruler shall carry the triangleupon thev other, and so that the movement of the wheel .isintermittently governed and limited by the a swing of a convenientfinger-piece to slide the l a triangle the required distance to form thespaces between the hatch-lines; and my improvements further relate tothe peculiar construction and arrangement of the parts for giving the.proper motionto the triangle, and for providing for its reversal ofdirection.

In the drawings, Figure I is a plan view of e the complete apparatus.Fig. 11 is a reverse view with the ruler removed. Fig. III is a sideview with the ruler in section. Fig. 1V

is a vertical section, and Figs. V, VI, and VII are detail views. a

The triangle B has one of its sides brought against the edge of theruler D by the frame sides at d, which, passing over the ruler, are

and one edge of the triangle that the ruler is inclos'ed. Arranged in aprotecting barrel, 0, from the frame, is the friction-wheel E in thesame plane as the ruler and triangle, and having its rim, as shown inFig. 11, to slightly project beyond the surface 0 to engage with theedge of the ruler to, by its rotat on, move the frame with the triangleover the ruler held upon the paper. The. rotation of wheel E is.eifected by means of the lever F in convenient reach of the finger whenoperating the device, and which piece F has its shank secured to a stem,g, from the wheel E, while itsi'urther end is bent down to swing betweenand be stopped by the sides d d.

a It is evidentthat were the wheel E rigidly connected to the leverfinger-piece F, the

struct the wheel E in sections, so thatwhen p the piece F is swung inone direction its friction-surface; moves against the ruler, while, inthe other, the inner section of the wheel moves independently, to beagain clutched with the friction part, to' enable the swing oftheileverF to move the triangle in one direction only. I

This 1 accomplish as follows: The frictionwhee] is made in the form ofan annular sec- 4 tion, as shown in Fig-IV, inclosing a' piece,

a, provided with the stem g, to which the lever F is attached, the parta is pared away on its perimeter, as seenin Fig. V, to acalnshape toleave a crescent-shaped space between the part a and inner wall ofsection E for the reception of a vertical pin, 3 which, being held fromthe part a, forms a clutch tounite the part a and annular section E atone part of a the rotation of part a, but releases them at the reverse.The part a is horizontally slotted past its axis to provide space forits pin-holder as, which I prefer to make as a small forlrbetween theends of which the'pin is held 5 the fork, for convenience ofconstruction, is made of thin metal,which is recessed in the slotted endof rod 2, which extends above the stem g to be secured by a hand, W.NVhen the .pin

y is in contact with the walls of sections aand E, the swinging of leverF can move the friction part E, and consequently the triangle B, in onlyone direction, but in order that the same movement of lever F maybe madeto propel the triangle for ruling purposes in either direction, 1 formthe camsurface upon part a of such length and shape'that, when the rod 2.is turned to (by means of the fork secured thereto) move the pin to oneendof the cam-surface, it will cause the wheel E to be clutched at adiflerent end of the traverse of handle F, and so enable themovement ofthe triangle to be reversed. The position of .the pint, relatively, isindicated by. the position of the hand W, which can be moved to mine thedirection to be moved by the triangle, or can be in the position shownin Fig. 11, to render the movement of piece F in either directioninoperative. The distance to which the triangle is moved at each swingof lever F being determined by the distance between sides d d, by meansof an adjustingscrew, 2, I am able to regulate the spaces between thehatch-lines. The friction-section E is held by a small flange upon thebase of part a, the stem g from which, passing through the cover of thebarrel 0, is clamped as aforesaid by the finger-piece'F, which, restingand turning on the shoulder m, holds the wheel E with all of its partsin proper position.

Without a departure from the principle of my invention, the ruler may beprovided with rubber on one edge to come in contact with a corrugatedwheel to secure the desired friction, ora spur-wheel may be used inconnection with a rack upon the ruler; but I prefer a slightlycompressible hard-rubber wheel for that purpose.

holder .90, and pin y, with operating-levenF,

for the purpose set' forth. 7

3. In combination withthe sections E and a, and with the clutch-pin y,pin-holder a2, and rod 2, the hand W, forthe purpose set forth.

4. In combination with finger-lever F, the sides d d of frame andset-screw 2, for the purpose shown and described,

JOHN B. PRICE.

Witnesses:

T. M. BROWN, It. F. HYDE.

